Magnesium aluminum pentafluoride/attapulgite/porous carbon composite material and preparation method and application thereof

A technology of attapulgite and composite materials, which is applied in chemical instruments and methods, water/sludge/sewage treatment, alkali metal compounds, etc., and can solve problems that affect the adsorption performance of attapulgite, fail to achieve environmental protection, and weaken physical and chemical properties. , to achieve significant superiority, low price, and cost reduction

Active Publication Date: 2019-04-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In natural attapulgite, attapulgite crystals and natural pores are filled with carbonate cement, which leads to the aggregation of crystal particles, making its pore structure, surface morphology and crystal packing state in an irregular state, which weakens its overall structure. Physical and chemical properties, thus affecting the adsorption performance of attapulgite
[0004] Chinese patent document CN 103316633 A discloses a preparation method of attapulgite/porous carbon composite material. Attapulgite and rice husk are used as raw materials, which are first mixed with sulfuric acid solution for heat treatment, then activated by alkali, and calci

Method used

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  • Magnesium aluminum pentafluoride/attapulgite/porous carbon composite material and preparation method and application thereof
  • Magnesium aluminum pentafluoride/attapulgite/porous carbon composite material and preparation method and application thereof
  • Magnesium aluminum pentafluoride/attapulgite/porous carbon composite material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Step a: Modification of raw ore attapulgite: 1) Purification: first, sieve the raw ore attapulgite with a 150-mesh sieve to obtain attapulgite raw ore powder (Pal powder) for later use; weigh 5.0g of the sieved Pal powder+ 2.0g NH 4 Cl+1.0g NaCl in a 500mL beaker, then add 232.0mL deionized water+11.0mL concentrated HNO 3 +7.0mL concentrated H 2 SO 4 Stir vigorously for 4 hours; after stirring, immerse for 0.5 hours, pour out the upper liquid, and only filter the lower part, wash with absolute ethanol and deionized water until neutral, and finally dry at 80°C; 2) Surface activation and production Hole: acidify the above dried sample with 250.0mL of HCl solution with a concentration of 5mol / L for 2 hours, filter with suction after acidification, wash with absolute ethanol and deionized water until neutral, and finally place in an oven Dry at 80°C;

[0033] Step b: Preparation of glucose-modified attapulgite precursor: Weigh 3.0g modified attapulgite and 2.0g glucose ...

Embodiment 2

[0041] Step a: Same as Example 1.

[0042] Step b: Preparation of glucose-modified attapulgite precursor: namely, the surface of modified attapulgite adsorbs carbon source, weigh 3.0g of modified attapulgite and 0.75g of glucose into a 500mL beaker, add 40.0mL of deionized water and continue Stir for 24 hours, and then place in a water bath at 80° C. until the water evaporates to prepare a precursor.

[0043] Step c: Put the precursor in a tube furnace with a helium gas flow rate of 40mL / min, a heating rate of 10°C / min, and roast at 700°C for 4h to obtain Pal@C.

[0044] Step d: Add Pal@C obtained in step c to 4 ml of 40% HF, add 6 ml of water, heat and stir at 80°C for 8 hours; wherein, the mass ratio of Pal@C, hydrofluoric acid and water is about 1:4:6; then filter with suction and wash with deionized water and absolute ethanol several times until neutral, then dry it in an oven at 90°C for 10 hours to obtain magnesium aluminum pentafluoride / attapulgite / porous carbon compo...

Embodiment 3

[0048] Step a: Same as Example 1.

[0049] Step b: Preparation of glucose-modified attapulgite precursor: namely, the surface of modified attapulgite adsorbs carbon source, weigh 3.0g modified attapulgite and 3.0g glucose into a 500mL beaker, add 40.0mL deionized water and continue Stir for 24 hours, and then place in a water bath at 80° C. until the water evaporates to prepare a precursor.

[0050] Step c: Put the precursor in a tube furnace with a nitrogen gas flow rate of 40mL / min, a heating rate of 8°C / min, and roast at 900°C for 2.5h to obtain Pal@C.

[0051] Step d: Add Pal@C obtained in step c to 6 ml of 40% HF, add 4 ml of water, and heat and stir at 80°C for 8 hours; wherein, the mass ratio of Pal@C, hydrofluoric acid and water is about 1 : 6: 4; then suction-filtered and washed several times with deionized water and absolute ethanol until neutral, and then dried in an oven at 70°C for 6 hours to obtain pentafluoromagnesium aluminum / attapulgite / porous carbon composit...

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Abstract

The invention provides a magnesium aluminum pentafluoride/attapulgite/porous carbon composite material and a preparation method and application thereof. The composite material is a multilayer structure taking attapulgite as a carrier, and a carbon nano tube layer is wrapped on the surface of the carrier, the pores of the carbon nano tube layer and the pores of the attapulgite are filled with the magnesium aluminum pentafluoride nano particles, and the magnesium aluminum pentafluoride nano particles are spread on the surface of the carbon nano tube layer. The method comprises the following steps of: acidifying the attapulgite to obtain modified attapulgite; carrying out carbon source adsorption and roasting on the modified attapulgite to obtain carbon-coated attapulgite; adding hydrofluoricacid and water into the carbon-coated attapulgite, heating and stirring, performing suction filtration, washing and drying to obtain the magnesium aluminum pentafluoride/attapulgite/porous carbon composite material; wherein the mass ratio of the attapulgite, hydrofluoric acid and water is 1: (6-2) : (4-8). The composite material is applied to the adsorption of anionic dye wastewater, and the maximum equilibrium adsorption capacity for Congo red dye is 1500-2100 mg/g.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a magnesium aluminum pentafluoride / attapulgite / porous carbon composite material and a preparation method and application thereof. Background technique [0002] With the rapid development of society and economy, the discharge of water pollutants has increased year by year, and the pollution problems in the water environment have become increasingly prominent. The pollution of surface water bodies not only poses a threat to aquatic organisms, but also destroys the ecological environment and ultimately endangers human health. Traditional methods for removing pollutants in water include biological methods, flocculation methods, advanced oxidation methods, membrane filtration methods, and adsorption methods. In contrast, the adsorption method can not only avoid secondary pollution, but also reduce the cost to a certain extent. [0003] Attapulgite is a hydrous magnesium ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/30
CPCB01J20/0248B01J20/0288B01J20/046B01J20/12B01J20/205B01J20/28035B01J20/3078B01J20/3085C02F1/288C02F2101/308
Inventor 唐爱东钟来富
Owner CENT SOUTH UNIV
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